The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 2011
Filed:
Mar. 26, 2010
Wataru Nakahori, Tokyo, JP;
Wataru Nakahori, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A witching power supply unit, which suppresses switching loss in switching elements and surge voltage onto an output rectifier device and reduces the number of components, is provided. The switching power supply unit include: a switching circuit of full bridge type disposed on the input side; a rectifier circuit disposed on the output side; a transformer disposed between the switching circuit and the rectifier circuit and including a first winding on the input side, a second winding on the output side, a third winding; a surge voltage suppressing circuit connected in parallel with the switching circuit; and a driving circuit. The third winding is connected to the full bridge circuit to form a H-bridge configuration. Magnetic coupling between the first and second windings and magnetic coupling between the first and third windings are both looser than that between the second and third windings.